EP2415535A1 - Procédé de fabrication de tube métallique sans soudure à paroi ultramince par procédé de laminage à froid - Google Patents

Procédé de fabrication de tube métallique sans soudure à paroi ultramince par procédé de laminage à froid Download PDF

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Publication number
EP2415535A1
EP2415535A1 EP10758469A EP10758469A EP2415535A1 EP 2415535 A1 EP2415535 A1 EP 2415535A1 EP 10758469 A EP10758469 A EP 10758469A EP 10758469 A EP10758469 A EP 10758469A EP 2415535 A1 EP2415535 A1 EP 2415535A1
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EP
European Patent Office
Prior art keywords
rolling
diameter
immediately before
tube material
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10758469A
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German (de)
English (en)
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EP2415535B1 (fr
EP2415535A4 (fr
Inventor
Chihiro Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP2415535A1 publication Critical patent/EP2415535A1/fr
Publication of EP2415535A4 publication Critical patent/EP2415535A4/fr
Application granted granted Critical
Publication of EP2415535B1 publication Critical patent/EP2415535B1/fr
Not-in-force legal-status Critical Current
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/06—Devices for revolving work between the steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/04—Pilgrim-step feeding mechanisms
    • B21B21/045—Pilgrim-step feeding mechanisms for reciprocating stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/04—Pilgrim-step feeding mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/06—Devices for revolving work between the steps
    • B21B21/065—Devices for revolving work between the steps for reciprocating stands

Definitions

  • the present invention intends to provide a method for producing an ultrathin-wall seamless metal tube by a high-reduction-rate, highly efficient rolling method utilizing a cold pilger mill of a mechatronics drive type developed in 1985.
  • a metal tube When a metal tube does not satisfy any requirement in quality, strength, or dimensional accuracy in a hot finished condition, the metal tube needs to be subjected to a cold working process.
  • Such cold working is generally performed by a cold drawing method using a die and a plug or mandrel, or a cold rolling method by a cold pilger mill.
  • a hollow shell is subjected to a diameter reducing rolling between a pair of rolls having a tapered groove whose diameter gradually decreases in a circumferential direction, and a tapered mandrel whose diameter gradually decreases similarly in a longitudinal direction. That is, each roll of the pair is provided with a groove on its circumference and the groove is shaped such that its width is narrowed as the rolling occur.
  • the rolls repeatedly move forward and backward while rotating along the taper of the mandrel, thereby rolling the hollow shell between the roll and the mandrel (such as Non Patent Literature 1).
  • Figure 1 is a diagram to show a rolling mechanism by a conventional cold pilger mill, in which Figure 1(a) illustrates a starting point of forward stroke, and Figure 1(b) illustrates a starting point of backward stroke.
  • a roll housing having a pair of grooved rolls 2 makes a reciprocating movement via a connecting rod of a crank mechanism. At that moment, pinions which are integrated with the rolls 2 engage with racks so that the rolls 2 are caused to rotate in association with the reciprocating movement.
  • the cold pilger mill includes a pair of grooved rolls 2 and a mandrel 4.
  • the grooved roll 2 has in its outer circumference a groove whose diameter smoothly varies from an outer diameter (d0 in the diagram) of the hollow shell 1 to the outer diameter (d in the diagram) of a finished rolled tube 5 as being from the engaging entry side toward the finishing exit side of the roll.
  • the mandrel 4 also has a tapered shape whose diameter smoothly varies in a similar fashion.
  • the roll housing having the above described rolls 2 makes a reciprocating movement thereby rolling the tube material (hollow shell) 1.
  • the tube material 1 is given a predetermined amount of travel (feed) and rotation (turn) angle immediately before the start of a forward stroke.
  • the feed is about 5 to 18 mm and the turn angle is about 60°.
  • the tube material is subjected to a diameter reducing rolling in both the forward and backward strokes. It was not, however, possible until about 25 years ago to give a feed and a turn angle to the tube material in the backward stroke, and only a re-rolling is performed to remove an elastic restitution in the elongation rolling of forward stroke.
  • Patent Literature 1 PCT/JP2007/073468
  • Non Patent Literature 1 Iron and Steel Handbook third edition," Vol. 3, (2) Steel Bar, Steel Tube, and Common Rolling Facilities, pp. 1183 to 1189 .
  • the present invention has been made in view of the above described problems, and has its object to provide a method for producing an ultrathin-wall seamless metal tube by a high-reduction-rate, highly efficient diameter expanding rolling method utilizing a cold pilger mill. More specifically, its object is to provide a method for producing an ultrathin-wall seamless metal tube by a cold rolling method by which equivalent amounts of turn angle and feed can be given not only immediately before the start of a forward stroke, but also immediately before the start of a backward stroke in a cold pilger mill that performs elongation rolling in both the forward and backward strokes.
  • the present inventors have previously invented a method for producing an ultrathin-wall metal tube, wherein in a rolling method by a cold pilger mill of mechanical drive type adapted for performing elongation rolling in both the forward and backward strokes in a single strand, a diameter expanding rolling is performed in both the forward and backward strokes using a roll having a groove whose diameter gradually increases from the engaging entry side to the finishing exit side, and a mandrel whose diameter also gradually increases from the engaging entry side to the finishing exit side; and proposed it as Patent Literature 1 as described above.
  • Patent Literature 1 hereafter also referred to as the "previous invention”
  • the invention is solely drawn to a conventional rolling method in which a feed and a turn angle are given mainly only immediately before the start of a forward stroke.
  • a diameter expanding rolling method reduces the energy consumption needed for elongation rolling, a surplus in driving energy is generated thereby enabling certain amounts of turn angle and feed to be given even in the backward stroke.
  • Figure 2 is a diagram to show a rolling method by a cold pilger mill of mechanical drive type relating to the previous invention, in which Figure 2(a) illustrates a starting point of a forward stroke, and Figure 2(b) illustrates a starting point of a backward stroke.
  • a pair of upper and lower rolls 21 each of which is provided in its circumference with a tapered groove 31 whose diameter smoothly increases from an engaging entry side toward a finishing exit side moves forward along arrow A shown in the diagram along the taper of a tapered mandrel 41 whose outer diameter smoothly increases from the engaging entry side toward the finishing exit side, so that a hollow shell 1 is subjected to elongation rolling between the surface of the tapered groove 31 of the roll 21 and the surface of the tapered mandrel 41.
  • the inventors have conducted the research and development of a cold rolling method, wherein in a cold pilger mill for performing elongation rolling in both the forward and backward strokes, equivalent amounts of turn angle and feed to those in the forward stroke can be given not only immediately before the start of a forward stroke, but also immediately before the start of a backward stroke, and have eventually completed the invention.
  • a diameter expanding rolling method is adopted in place of the conventional diameter reducing rolling method.
  • the diameter expanding rolling method since a hollow shell having a smaller diameter is used compared with the case of a diameter reducing rolling to obtain the same product dimension, the rolling load in both the forward and backward strokes will remarkably decrease. This point is the same as in the case of the method for producing an ultrathin-wall metal tube according to the previous invention by the present inventors.
  • the term "diameter expanding rolling” not only refers to a rolling method for simultaneously expanding the inner and outer diameters of a tube material, but also generally refers to the rolling method for expanding the mid-wall diameter (the average diameter of the inner and outer diameters) of a tube material.
  • Figures 3 and 4 are conceptual diagrams to show the variations in the rolling load from the engaging entry side to the finishing exit side in both the forward and backward strokes in a diameter reducing rolling method and a diameter expanding rolling method.
  • Figure 3 shows the variation of rolling load in a diameter reducing rolling method
  • Figure 4 shows the variation of rolling load in a diameter expanding rolling method.
  • the present invention has been completed based on the above described findings, and the gist of the invention consists in the method for producing an ultrathin-wall metal tube by a cold rolling method shown in the following (1) and (2).
  • a method for producing an ultrathin-wall seamless metal tube by a cold rolling method employs a cold pilger mill of mechatronics drive type, including: an electric control system to control a reciprocating movement of a roll stand and a shell drive of a tube material; and a mechanism to give a feed and a turn angle to the tube material immediately before the start of a forward stroke and immediately before the start of a backward stroke, and the cold rolling method includes: utilizing a roll having a groove whose diameter gradually increases, remains constant, or gradually decreases from an engaging entry side to a finishing exit side of a pair of rolls, and a tapered mandrel whose diameter gradually increases similarly from the engaging entry side to the finishing exit side; and giving a turn angle and a feed to the tube material immediately before the start of a forward stroke, and also giving a shell drive to the tube material immediately before the start of a backward stroke to an extent that is the same as or similar to the forward stroke so as to elongate the tube material
  • a system of giving a rotation angle (turn angle) to the tube material, a system of giving a feed to the tube material, or a system of giving a rotation angle (turn angle) and a feed to the tube material can be adopted as the shell drive immediately before the start of a backward stroke.
  • roll stand refers to a roll housing having a grooved roll 2.
  • shell drive refers to an action to give a feed in a tube longitudinal direction or/and a rotation (turn) around the tube axis to the tube material (hollow shell) 1.
  • ultrathin-wall seamless metal tube refers to a seamless metal tube having a (wall thickness/outer diameter) ratio of not more than 4%.
  • the present invention is a diameter expanding rolling method using a cold pilger mill of mechatronics drive type including a mechanism to give a feed and a turn angle to the tube material not only immediately before the start of a forward stroke but also immediately before the start of a backward stroke, whereby a shell drive can be given to the tube material in a stable manner even immediately before the start of a backward stroke without generating an excessive rolling load and without resulting in an excessive imbalance in the rolling load between the forward stroke and the backward stroke.
  • This makes it possible to realize a further increase in the reduction-rate of rolling and a further reduction of wall thickness, and significantly improve the dimensional accuracy and the production efficiency of the rolled tube product compared with the diameter expanding rolling method of the previous invention.
  • the present invention is a method for producing an ultrathin-wall seamless metal tube by a cold rolling method, wherein the cold rolling method employs a cold pilger mill of mechatronics drive type, including an electric control system to control a reciprocating movement of a roll stand and a shell drive of a tube material, and a mechanism to give a feed and a turn angle to the tube material immediately before the start of a forward stroke and immediately before the start of a backward stroke, and the cold rolling method includes: utilizing a roll having a groove whose diameter gradually increases, remains constant, or gradually decreases from an engaging entry side to a finishing exit side of a pair of rolls, and a tapered mandrel whose diameter gradually increases similarly from the engaging entry side to the finishing exit side; and giving a turn angle and a feed to the tube material immediately before the start of a forward stroke, and also giving a turn angle or/and a feed to the tube material immediately before the start of a backward stroke so as to elongate the tube material by reducing
  • FIG. 5 is a diagram to show a schematic configuration of a cold pilger mill by a mechanical drive system.
  • a roll unit is contained in a roll stand 63 and connected to a crankshaft 62 via a connecting rod 77.
  • the crankshaft 62 rotates by being driven by a main motor 61, and the roll stand 63 makes a reciprocating movement in a forward and backward direction at a constant frequency.
  • a pair of upper and lower rolls 64 are rotated by racks and pinions 65 as the roll stand 63 moves forward and backward, thereby rolling a hollow shell (tube material).
  • a mandrel (not shown) is secured by a mandrel rod chuck 74.
  • the hollow shell is held by an entry chuck 75 and an exit chuck 76, and a feed carriage 70 is located at the rear edge thereof.
  • the rotation of the crankshaft 62 is transferred to a feed cam 69 and a rotation cam 73 via bevel gears 66 and 68 and a line shaft 67.
  • the feed cam 69 causes the feed carriage 70 to move forward by the amount of lift of the cam at every time the roll stand 63 makes a round trip.
  • the feed carriage 70 is caused to move forward at a constant speed so as to be intermittently traveled by a feed screw 72 that is rotated by the line shaft 67 via a feed change gear 71.
  • FIG. 6 is a diagram to show a schematic configuration of a cold pilger mill by a mechatronics drive system.
  • the mechatronics system is a scheme of linking the feed mechanism of the hollow shell with the turning mechanism of the hollow shell and the mandrel by mechatronics, and of independently driving them by a DC servo motor or a hydraulic servo motor which is driven separately from the main motor 81.
  • the mechatronics system includes a rotation phase detector 86 attached to a crankshaft 82, a dedicated drive motor 89 for carriage feed, a dedicated drive motor 88 for hollow shell and mandrel turn, and a control unit 87.
  • a signal from the rotation phase detector 86 is inputted to the control unit 87, and the control unit 87 performs a feedback control of the dedicated drive motor 89 for feed and the dedicated drive motor 88 for rotation at a timing synchronized to the motion of a roll stand 83.
  • the periods of the reciprocating movement of the roll stand 83 and shell drive are controlled by an electric control system, and determination on whether the roll stand 83 is in a rolling section or in an idling section is performed by detecting a crank rotation angle by the rotation phase detector 86 at the end of the crankshaft. Based on that signal, a shell drive is performed at an instant of the transition from the rolling section to the idling section.
  • Figures 7 to 9 are diagrams to illustrate examples of the rolling method by a cold pilger mill relating to the present invention, in which Figures 7(a), 8(a) and 9(a) show a starting point of a forward stroke, and Figures 7(b), 8(b) and 9(b) show a starting point of a backward stroke.
  • FIG. 7 is a diagram to show a first aspect of the rolling method by a cold pilger mill relating to the present invention.
  • a pair of upper and lower rolls 21, each of which is provided in its circumference with a tapered groove 31 whose diameter smoothly increases from an engaging entry side to a finishing exit side is caused to move forward in the direction shown by arrow A in the diagram along the taper of a tapered mandrel 41 whose outer diameter smoothly increases from the engaging entry side to the finishing exit side.
  • This will make the hollow shell 1 undergo elongation rolling between the surface of the tapered groove 31 of the roll 21 and the surface of the tapered mandrel 41.
  • Figure 8 is a diagram to show a second aspect of the rolling method by a cold pilger mill relating to the present invention.
  • the second aspect of the present invention is a method for producing an ultrathin-wall metal tube by a cold pilger mill in which elongation is performed by decreasing the wall thickness while expanding only the inner diameter with the outer diameter being kept constant and unchanged.
  • FIG 9 is a diagram to show a third aspect of the rolling method by a cold pilger mill relating to the present invention.
  • the third aspect of the present invention is a method for producing an ultrathin-wall metal tube by a cold pilger mill in which elongation is performed by decreasing the wall thickness while reducing the outer diameter and expanding the inner diameter under the controlled condition that the amount of diameter expansion of the inner diameter is larger than the amount of diameter reduction of the outer diameter.
  • the hollow shell 1 is subjected to elongation rolling between the tapered groove 13 of the roll 12 and the tapered mandrel 14 in the same manner as in the first aspect of Figure 7 described above.
  • a 18% Cr-8% Ni stainless steel tube having an outer diameter of 48.6 mm, an inner diameter of 41.6 mm, and a wall thickness of 3.5 mm produced by the Ugine extrusion process was used as the hollow shell for testing, and the hollow shell was subjected to a diameter expanding rolling by a cold pilger mill of mechatronics drive type so as to have an outer diameter of 50.8 mm, an inner diameter of 47.8 mm, and a wall thickness of 1.5 mm.
  • the same amounts of feed and turn angle as those immediately before the start of a forward stroke were given immediately before the start of a backward stroke. Test conditions and results are summarized below.
  • a 25% Cr-35% Ni-3% Mo high alloy steel tube having an outer diameter of 47.2 mm, an inner diameter of 40.2 mm, and a wall thickness of 3.5 mm produced by the Mannesmann-mandrel mill process was used as the hollow shell for testing, and the hollow shell was subjected to a diameter expanding rolling by a cold pilger mill of mechatronics drive type so as to have an outer diameter of 50.8 mm, an inner diameter of 48.2 mm, and a wall thickness of 1.3 mm.
  • the same amount of feed and turn angle as those immediately before the start of a forward stroke were given immediately before the start of a backward stroke. Test conditions and results are summarized below.
  • the steel tubes obtained from the above described testing of two Examples had beautiful inner and outer surface textures, and their qualities deserve special mention. It is noted that when elongation rolling was performed by a conventional diameter reducing rolling method in which neither feed nor turn angle was given immediately before the start of a backward stroke, the minimum wall thicknesses which could be produced for a stainless steel tube and a high alloy steel tube were about 2.0 to 2.5 mm when the outer diameter was 50.8 mm. Therefore, the effect of the method for producing an ultrathin-wall seamless metal tube by a diameter expanding rolling method relating to the present invention is extremely marked.
  • the present invention has solved the problems of the increase of the excessive rolling load and the imbalance in the rolling load when amounts of feed and turn angle equivalent or nearly equivalent to those in the forward stroke are given immediately before the start of a backward stroke as well in a diameter expanding rolling method by a cold pilger mill of mechatronics drive type, and has realized a further increase in the reduction-rate of rolling and a further reduction of wall thickness, as well as has significantly improved the dimensional accuracy and the production efficiency of the rolled tube product.
  • the present invention is a diameter expanding rolling method in which not so much larger ratio of diameter expansion is applied, which will provide significant merits in the production technology. For example, applying not so much larger ratio of diameter expansion will allow a conventional system to be utilized as-is without need of particularly modifying the shell drive system of a cold pilger mill.
  • the present invention intends to claim proprietary rights in the cold rolling by a cold pilger mill of mechatronics drive type in which the reciprocating movement of the roll stand and the shell drive of a tube material are controlled by an electric control system
  • the present invention can be utilized as-is in a cold rolling by a cold pilger mill of mechanical drive type in which the reciprocating movement of the roll stand and the shell drive are controlled by a mechanical control system.
  • this is based on the premise that a further technical innovation is achieved in the mechanical structure of the cold pilger mill of mechanical drive type.
  • Tube material (hollow shell)
  • 2 Grooved roll
  • 3 Tapered groove
  • 4 Tapered mandrel
  • 5 Rolled tube
  • 21 Grooved roll
  • 31 Tapered groove
  • 41 Tapered mandrel
  • 51 Rolled tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP10758469.0A 2009-04-03 2010-03-23 Procédé de fabrication de tube métallique sans soudure à paroi ultramince par procédé de laminage à froid Not-in-force EP2415535B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009090890A JP2010240681A (ja) 2009-04-03 2009-04-03 冷間圧延法による超薄肉継目無金属管の製造方法
PCT/JP2010/054943 WO2010113695A1 (fr) 2009-04-03 2010-03-23 Procédé de fabrication de tube métallique sans soudure à paroi ultramince par procédé de laminage à froid

Publications (3)

Publication Number Publication Date
EP2415535A1 true EP2415535A1 (fr) 2012-02-08
EP2415535A4 EP2415535A4 (fr) 2013-05-29
EP2415535B1 EP2415535B1 (fr) 2017-09-20

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EP10758469.0A Not-in-force EP2415535B1 (fr) 2009-04-03 2010-03-23 Procédé de fabrication de tube métallique sans soudure à paroi ultramince par procédé de laminage à froid

Country Status (7)

Country Link
US (1) US8528378B2 (fr)
EP (1) EP2415535B1 (fr)
JP (1) JP2010240681A (fr)
KR (1) KR101364373B1 (fr)
CN (1) CN102365136A (fr)
ES (1) ES2650635T3 (fr)
WO (1) WO2010113695A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN103495617B (zh) * 2013-09-25 2015-08-12 中北大学 一种变壁厚筒体零件辊挤成型装置
KR101584300B1 (ko) 2015-06-11 2016-01-11 최광준 맨드릴용 윤활유 공급이 가능한 필거 밀
CN106862273A (zh) * 2017-04-10 2017-06-20 广东科莱博科技有限公司 一种冷轧管的轧制方法
US10525516B2 (en) * 2017-05-03 2020-01-07 Victaulic Company Cam grooving machine with cam stop surfaces
CN108465701A (zh) * 2018-03-27 2018-08-31 常州市环华机械有限公司 内异形管双辊冷轧模具、加工方法及内异形管的冷轧方法
CN108405621A (zh) * 2018-03-27 2018-08-17 常州市环华机械有限公司 大口径超厚壁管的冷轧方法
CN108213081A (zh) * 2018-03-27 2018-06-29 常州市环华机械有限公司 大变形量超薄壁管的冷轧方法
CN113102537B (zh) * 2021-04-14 2022-03-15 中北大学 一种适用于大尺寸薄壁锥形壳体省力成形的成套模具

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GB2093384A (en) * 1981-02-24 1982-09-02 Mannesmann Ag Pilger rolling of tubes
JPH01192405A (ja) * 1988-01-25 1989-08-02 Nuclear Fuel Ind Ltd 金属管の製造方法
EP1884296A1 (fr) * 2005-05-27 2008-02-06 Sumitomo Metal Industries, Ltd. Procede de fabrication de tube metallique a paroi ultra mince par procede d'usinage a froid

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DE1602036A1 (de) * 1966-02-17 1970-08-06 Calumet & Hecla Corp Verfahren zum Verkleinern des Durchmessers von Rohren
GB2093384A (en) * 1981-02-24 1982-09-02 Mannesmann Ag Pilger rolling of tubes
JPH01192405A (ja) * 1988-01-25 1989-08-02 Nuclear Fuel Ind Ltd 金属管の製造方法
EP1884296A1 (fr) * 2005-05-27 2008-02-06 Sumitomo Metal Industries, Ltd. Procede de fabrication de tube metallique a paroi ultra mince par procede d'usinage a froid

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Title
See also references of WO2010113695A1 *

Also Published As

Publication number Publication date
ES2650635T3 (es) 2018-01-19
US20120036911A1 (en) 2012-02-16
US8528378B2 (en) 2013-09-10
CN102365136A (zh) 2012-02-29
KR101364373B1 (ko) 2014-02-17
KR20110134474A (ko) 2011-12-14
EP2415535B1 (fr) 2017-09-20
WO2010113695A1 (fr) 2010-10-07
JP2010240681A (ja) 2010-10-28
EP2415535A4 (fr) 2013-05-29

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